From 2-spyware.com
Phreaker ransomware is a malicious program that uses complicated encryption algorithms to lock users’ personal files, like photos, videos, and documents. The variant belongs to the Chaos ransomware family. Besides locking people’s data, it changes the desktop wallpaper.
When the file-locking virus infiltrates the system, it appends the affected files with an extension that consists of four random characters. The icons are also changed to white pages so thumbnails are unavailable. Encrypted files are impossible to open. Such infections can result in permanent data loss if users do not have backups.